http://forum.aqua-fish.net/ A forum devoted to aquarium fish, plants, techniques and fish keeping as a whole. en http://forum.aqua-fish.net/?topic=discus-tank#1 I have a 6foot tank it holds 300 lits i have two internal filtters in it and heaters live plants and i got one of the c02 can tings and the plants have been grown i got told to take the filtter pads my other tank and wash them in it for backter and put my drift wood in it its been running for about 3 weeks now and i tested it and the ph and all that is ok going to put discus in it how much can i put in it and if there is enything more i have to do? jamesmcmillan 2011-06-29 http://forum.aqua-fish.net/?topic=discus-tank#2 What have you been feeding the bacteria on during the three weeks, they need a source of ammonia to survive. You will need to test the ammonia, nitrite and nitrate levels to make sure that the tank is cycled before adding any Discus fish. mickey 2011-08-23